New and interesting records of rare caddisflies (Trichoptera, Insecta) from Slovakia with comments on their ecology and conservation status

Abstract

The distribution and diversity of insects are crucial conservation issues. The order Trichoptera is comprised of numerous endangered species, but the rarity of some makes it challenging to determine their conservation priority. In recent decades, data based on caddisfly larvae have become more frequent in limnological research in Slovakia. Our research, focusing mainly on adult caddisflies, has led to more reliable and accurate identification of many species that cannot be identified with certainty in the larval stage.We combined several entomological methods, including sweeping, Malaise traps, and UV light attraction, to increase the likelihood of catching rare species. The text lists and discusses the discoveries of caddisfly species that are particularly important for faunistics or biodiversity in Slovakia, as well as in the Central European context. Enoicyla reichenbachii (Kolenati, 1848), Limnephilus incisus Curtis, 1834, Ptilocolepus granulatus (Pictet, 1834) and Oecetis testacea (Curtis, 1834) were recorded for the first time in Slovakia. The rare species Hagenella clathrata (Kolenati, 1848) and Adicella balcanica Botosaneanu and Novák, 1965, previously found in Slovakia, were also recorded. Additionally, a new locality of Adicella syriaca Ulmer, 1907 indicates a further northward shift of this Mediterranean species. We further discussed the faunistically important records of Beraeamyia hrabei Mayer, 1937, Allotrichia pallicornis (Eaton, 1873), Ceraclea riparia (Albarda, 1874), Grammotaulius nitidus (Müller, 1764) and Limnephilus fuscicornis Rambur, 1842 from Slovakia. The conservation status of each species is proposed and discussed on the basis of our faunistic records, in accordance with the forthcoming update of the Slovak Red Book.